Camber and deflections are calculated at the 0.1L, 0.3L, and 0.5L (midspan). Prestress losses for deflection are calculated as specified in LRFD Art. 5.9.5.5. The LRFD code specifies that the moment of inertia can be taken as the gross moment of inertia, Ig, or effective moment of inertia, Ie. Precast/Prestressed Girder uses the gross moment of inertia, Ig.

Deflections of self-weight and dead load on precast for supported beams are computed based on formulas from statics. The deflections due to dead load on composite and live load are computed for the composite model. Uplift due to prestress is computed using the moment-area approach for each beam. Each strand group is treated separately with consideration given to individual strand transfer distances in the construction of the total M/EI diagram. Therefore, the effects of draping and multiple shielding can be handled accurately.

Deflection due to live loads will only be calculated if you selected the Include Live Load Deflection checkbox under Live Load on the Loads Tab. These deflections will be calculated as per LRFD Art. 2.5.2.6.2, Criteria for Deflection. Long-term deflections are computed by multiplying the initial/release calculations by factors specified in Reference 10, PCI Design Handbook, Table 4.8.2.